1 files changed, 7 insertions, 0 deletions
diff --git a/ruby.c b/ruby.c
index 16cf652b5e..3821b939d8 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1296,6 +1296,13 @@ process_options(VALUE arg)
 	opt->src.enc.index = opt_enc_index(opt->src.enc.name);
 	src_encoding_index = opt->src.enc.index;
     }
+    if (opt->ext.enc.index >= 0) {
+	enc = rb_enc_from_index(opt->ext.enc.index);
+    }
+    else {
+	enc = lenc;
+    }
+    rb_enc_set_default_external(rb_enc_from_encoding(enc));
     if (opt->intern.enc.index >= 0) {
 	enc = rb_enc_from_index(opt->intern.enc.index);
 	rb_enc_set_default_internal(rb_enc_from_encoding(enc));